:file attribute must appear on the first call to package(:izpack) or it will have no effet
package(:izpack, :file => myInstaller).locales = 'eng', 'fra', 'deu'

we create file task for each file to be packed
file(myFirstTextFile) do Buildr.write(myFirstTextFile, "This is file 1_5.txt") end
file(mySecondTxtFile) do Buildr.write(mySecondTxtFile, "This is file 3_7.txt") end